// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/chromeos/user_activity_power_manager_notifier.h"

#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/power_manager_client.h"
#include "ui/base/user_activity/user_activity_detector.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_codes_posix.h"

namespace ui {
namespace {

    // Minimum number of seconds between notifications.
    const int kNotifyIntervalSec = 5;

    // Returns a UserActivityType describing |event|.
    power_manager::UserActivityType GetUserActivityTypeForEvent(
        const Event* event)
    {
        if (!event || event->type() != ET_KEY_PRESSED)
            return power_manager::USER_ACTIVITY_OTHER;

        switch (static_cast<const KeyEvent*>(event)->key_code()) {
        case VKEY_BRIGHTNESS_DOWN:
            return power_manager::USER_ACTIVITY_BRIGHTNESS_DOWN_KEY_PRESS;
        case VKEY_BRIGHTNESS_UP:
            return power_manager::USER_ACTIVITY_BRIGHTNESS_UP_KEY_PRESS;
        case VKEY_VOLUME_DOWN:
            return power_manager::USER_ACTIVITY_VOLUME_DOWN_KEY_PRESS;
        case VKEY_VOLUME_MUTE:
            return power_manager::USER_ACTIVITY_VOLUME_MUTE_KEY_PRESS;
        case VKEY_VOLUME_UP:
            return power_manager::USER_ACTIVITY_VOLUME_UP_KEY_PRESS;
        default:
            return power_manager::USER_ACTIVITY_OTHER;
        }
    }

} // namespace

UserActivityPowerManagerNotifier::UserActivityPowerManagerNotifier(
    UserActivityDetector* detector)
    : detector_(detector)
{
    detector_->AddObserver(this);
}

UserActivityPowerManagerNotifier::~UserActivityPowerManagerNotifier()
{
    detector_->RemoveObserver(this);
}

void UserActivityPowerManagerNotifier::OnUserActivity(const Event* event)
{
    base::TimeTicks now = base::TimeTicks::Now();
    // InSeconds() truncates rather than rounding, so it's fine for this
    // comparison.
    if (last_notify_time_.is_null() || (now - last_notify_time_).InSeconds() >= kNotifyIntervalSec) {
        chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->NotifyUserActivity(GetUserActivityTypeForEvent(event));
        last_notify_time_ = now;
    }
}

} // namespace ui
